The Caturmasya Observances and the Rite of Vishnu’s Sleep (Aśūnya-Śayana) and Shiva’s Monthly Vows
कङ्काः समं बलाकाभिरारोहन्ति नगोत्तमान् वायसाश्चापि सुर्वन्ति नीडानि ऋषिपुङ्गव वायसाश्च स्वपन्त्येते ऋतौ गर्भभरालसाः
kaṅkāḥ samaṃ balākābhirārohanti nagottamān vāyasāścāpi survanti nīḍāni ṛṣipuṅgava vāyasāśca svapantyete ṛtau garbhabharālasāḥ
“Ang mga tagak, kasama ng mga gruwa, ay umaakyat sa pinakamainam na mga bundok. Ang mga uwak man ay gumagawa ng kanilang mga pugad, O pinakadakila sa mga rishi; at ang mga uwak na ito ay natutulog sa panahong iyon, nanlalambot dahil sa bigat ng pagdadalantao.”
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Dharma is taught through observation of ṛtu-lakṣaṇa (seasonal characteristics): nature’s cycles—nesting, migration, gestation—become cues for human restraint, timing, and appropriate observance.
This is calendrical/ritual-auxiliary material (ācāra and kāla-nirṇaya style), not directly sarga/pratisarga/vaṃśa/manvantara/vaṃśānucarita, though Purāṇas often embed such instruction alongside them.
Birds nesting and ‘sleeping’ in season symbolize withdrawal and consolidation—an inward turn appropriate to rains—supporting the Purāṇic idea that correct practice follows the tempo of the cosmos.